private void BuildConnectionString()
{
if (!SerialPort.GetPortNames().Contains(CommPortName.Text))
{
ConnectionString.Text = InvalidConfiguration;
return;
}
var commPortName = CommPortName.Text;
var endpoint = new SerialDeviceEndpoint(
commPortName,
Settings.Default.CommDataRate,
Settings.Default.CommParity,
Settings.Default.CommDataBits,
Settings.Default.CommStopBits,
Settings.Default.CommDtrActive,
Settings.Default.CommRtsActive);
var builder = new StringBuilder(endpoint.ToString());
// Due to a limitation in ASCOM.ReactiveCommunications, we have to add the DTR and RTS flags manually
builder.Append(Settings.Default.CommDtrActive ? ",DTR" : ",NoDTR");
builder.Append(Settings.Default.CommRtsActive ? ",RTS" : ",NoRTS");
var connectionString = builder.ToString();
Settings.Default.ConnectionString = connectionString;
ConnectionString.Text = connectionString;
}
private string TalkWithAxis(AXISID axis, char cmd, string cmdDataStr)
{
string response = string.Empty;
DeviceEndpoint endPoint = SerialDeviceEndpoint.FromConnectionString(ConnectionString);
const int BufferSize = 20;
StringBuilder sb = new StringBuilder(BufferSize);
sb.Append(cStartChar_Out); // 0: Leading char
sb.Append(cmd); // 1: Length of command( Source, distination, command char, data )
// Target Device
sb.Append(((int)axis + 1).ToString()); // 2: Target Axis
// Copy command data to buffer
sb.Append(cmdDataStr);
sb.Append(cEndChar); // CR Character
string cmdString = sb.ToString();
var cmdTransaction = new EQTransaction(cmdString)
{
Timeout = TimeSpan.FromSeconds(TimeOut)
};
using (ICommunicationChannel channel = new SerialCommunicationChannel(endPoint))
using (var processor = new ReactiveTransactionProcessor())
{
var transactionObserver = new TransactionObserver(channel);
processor.SubscribeTransactionObserver(transactionObserver);
try
{
channel.Open();
// prepare to communicate
for (int i = 0; i < Retry; i++)
{
Task.Run(() => processor.CommitTransaction(cmdTransaction));
cmdTransaction.WaitForCompletionOrTimeout();
if (!cmdTransaction.Failed)
{
response = cmdTransaction.Value;
break;
}
else
{
Trace.TraceError(cmdTransaction.ErrorMessage.Single());
}
}
}
catch (Exception ex)
{
Trace.TraceError("Connnection Lost");
throw new Exception("AstroEQ not responding", ex);
}
finally
{
// To clean up, we just need to dispose the TransactionObserver and the channel is closed automatically.
// Not strictly necessary, but good practice.
transactionObserver.OnCompleted(); // There will be no more transactions.
transactionObserver = null; // not necessary, but good practice.
endPoint = null;
}
}
return(response);
}
private void BuildSerialConnectionString()
{
var candidate = new SerialDeviceEndpoint(CommPortName.Text);
Settings.Default.ConnectionString = candidate.ToString();
}
